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引用本文:李书文,周真明,杨思明,刘淑坡,李飞,苑宝玲.煅烧改性净水厂污泥对底泥内源磷释放的控制效果.湖泊科学,2019,31(4):961-968. DOI:10.18307/2019.0415
LI Shuwen,ZHOU Zhenming,YANG Siming,LIU Shupo,LI Fei,YUAN Baoling.The efficiency of controlling the phosphorus release from the sediment using calcined modified water purification plant sludge (C-WTPS). J. Lake Sci.2019,31(4):961-968. DOI:10.18307/2019.0415
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煅烧改性净水厂污泥对底泥内源磷释放的控制效果
李书文, 周真明, 杨思明, 刘淑坡, 李飞, 苑宝玲
华侨大学土木工程学院, 厦门 361021
摘要:
以自主研发的煅烧改性净水厂污泥(C-WTPS)作为污染底泥活性覆盖材料,室内静态模拟实验研究C-WTPS覆盖强度对控制底泥磷释放效果的影响,分析C-WTPS和底泥中不同形态磷含量变化,探讨C-WTPS薄层覆盖对上覆水体中pH、DO和ORP的影响.结果表明,实验历时40天,在底泥TP释放强度为6.25~10.87 mg/(m2·d)时,覆盖强度为0.25、0.50、1.00、1.50和2.00 kg/m2的C-WTPS对TP平均削减率分别为59.68%、75.71%、88.75%、92.42%和96.28%,可见覆盖强度为1.00 kg/m2以上的C-WTPS能控制底泥中90%以上TP释放.C-WTPS吸附的磷主要以无机磷(IP)中的铁铝结合态磷(NAIP)形式存在,有机磷(OP)和钙磷(AP)形式较少.C-WTPS促进了底泥中易释放形态磷迁移到C-WTPS中,并转化较为稳定的形态磷,可见C-WTP覆盖不仅控制了底泥磷释放,而且也削减了底泥磷释放风险.C-WTPS覆盖后,上覆水体中pH开始呈现下降趋势,最终维持在pH=7范围波动;C-WTPS覆盖强度越大,上覆水体pH下降也明显;C-WTPS覆盖改善上覆水体中DO和ORP环境的效果不明显.
关键词:  底泥  薄层覆盖  煅烧改性净水厂污泥  磷释放  不同形态磷
DOI:10.18307/2019.0415
分类号:
基金项目:福建省高校产学合作重大项目(2018Y4101)、国家自然科学基金项目(51678255,51878300)、福建省引导性项目(2015Y0037)、泉州市高层次人才创新创业项目(2017Z025)、华侨大学中青年教师科研提升资助计划项目(ZQN-PY313)和华侨大学研究生科研创新基金项目联合资助.
The efficiency of controlling the phosphorus release from the sediment using calcined modified water purification plant sludge (C-WTPS)
LI Shuwen, ZHOU Zhenming, YANG Siming, LIU Shupo, LI Fei, YUAN Baoling
College of Civil Engineering, Huaqiao University, Xiamen 361021, P. R. China
Abstract:
In this paper, the self-developed calcined water treatment plant sludge (C-WTPS) was used as an active sediment capping material for contaminated sediments. The static simulation experiment was conducted to study the effect of C-WTPS capping intensity on controlling phosphorus release from the sediment. Changes of phosphorus contents with different forms in the C-WTPS and sediment were analyzed, and the effect of thin-layer capping of C-WTPS on the pH, dissolved oxygen (DO) and oxidation-reduction potential (ORP) in overlying water was also discussed. The results showed that during a 40-day experiment, when the total phosphorus (TP) release intensity of the sediment was 6.25-10.87 mg/(m2·d), the TP average reduction rate of C-WTPS with the capping intensity of 0.25, 0.50, 1.00, 1.50 and 2.00 kg/m2 were 59.68%, 75.71%, 88.75%, 92.42% and 96.28%, respectively. It means that C-WTPS with a capping intensity over 1.00 kg/m2 could restrain over 90% TP from releasing. The phosphorus adsorbed by C-WTPS mainly exist in the form of iron-aluminum bounded phosphorus (NAIP)which were included in the inorganic phosphorus (IP), but the forms of organic phosphorus (OP) and calcium phosphate (AP) were less. C-WTPS promoted the migration of phosphorus which were easily released into the C-WTPS and turn it into the relatively stable phosphorus. It showed that the using capping material C-WTPS could not only control the release of phosphorus from the sediment but also reduce the potential risk of phosphorus release. During the process of C-WTPS capping, the pH of the overlying water began to decline at first, and maintained to be around 7 in the end. The higher intensity of capping was used, the lower pH in the overlying water was discovered. Although, the effect of improving the overlying water by using covering material C-WTPS in the DO and ORP were not obvious.
Key words:  Sediment  thin-layer capping  calcined water treatment plant sludge  phosphorus release  different forms of phosphorus
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